Improvement in gages



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GAGES.

Patented Feb. 6, 1877.

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N.FETERS. FHOTO-LITHUGRAFHER, WASHINGTON. D. C4

UNITED STATES PATENT OFFIOE.

FREDERICK J. SEYBOLD, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALF HISRIGHT TO JAMES D. VANDERFORD, OF ST. LOUIS, MISSOURI.

IMPROVEMENT IN GAGES.

Specification forming part of Letters Patent No. 187,052, dated February6, 1877; application filed October 23, 1876.

To all whom it may concern Be it known that I,FREDERIGK J. SEYBoLn, ofthe city of Chicago, in the county of Cook and State of Illinois, haveinvented a new and useful lmprovementin Micr0meters,which improvement isfully set forth in the following specification, reference being bad tothe accompanying drawings.

Figure 1 shows the upper or index plate of my micrometer,with the handor index-pointer O, and the dial or circular scale B, and the upper endof the cylinder L. (Shown more fully in Fig. 3.) Fig. 2 shows thereverse side of the same plate as shown in Fig. 1, to which the works ofthe micrometer are attached.

The bottom plate that covers these works is removed. This plate (whichis not shown) fits over the works, and is screwed to the plate A at thepoints R, and separated from it by the rim P, which is about the samethickness of the works, and leaves just room for them to work freelybetween the two plates. D is a movable plate or jaw, with its nipper endresting against the nipper end of the stationary jaw E. ,F is a stemattached to the movable jaw D. To the points I of the jaw D is attacheda chain or cord, K, which is coiled around the cylinder L.

Pressure on the stem F turns the jaw D on the pivot G, and the chain K,as it uncoils from the cylinder L, revolves the cylinder L,

and with it the index-hand 0, attached to one end of the cylinder. Thejaw D is thrown back to its place again, by the spring H. N is simply abearing for the lower end of cylinder L.

The article to be measured is placed between the nipper-points D and E,which are thrown apart by the pressure on the stem F. A very smallobject placed between the points D and E will move the index-pointer O acomparatively large distance on the dial B. By this means the slightestdifi'erence in size or thickness of different bodies can be readily andeasily ascertained.

What I claim as new and as my invention, and wish to secure by LettersPatent, is-

, 1. The combination of the movable nipper or jaw D with the chain orcord K, cylinder L, and index-hand O, as shown and described, for thepurpose set forth.

2. The combination ofjaw D with the spring H, in the manner shown anddescribed, and for the purpose set forth.

3. The combination of the plate A with the jaws D and E, spring El,chain K, cylinder L, index-hand G, and stem F, as shown and described,and for the purpose set forth.

FREDERICK J. SEYBOLD.

Witnesses:

MARION U. HIGGINS, JAMES D. VANDERFORD.

